Improvement in sewing-machines



C. PARHAM.

' Sewing Machine.

Patented Nov. 22, 1870.

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CHARLES PARHAM, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN SEWING-MACHlNES.

Specification forming part of Letters Patent No. 109,443, dated November22, 1870.

To all whom it may concern:

Be it known that I, CHARLES PARHMI, of` Philadelphia, in the county ofPhiladelphia and State of Pennsylvania, have invented certain new anduseful Improvements in Sewing- Machines; and that the following is afull and exact description of the construction and operation of thesame, reference being had to the accompanying drawings, making a part ofthis speciiicat-ion, in which- Figure l represents a perspective view ofmy machine. Fig. 2 represents a longitudinal vertical section throughthe machine. Fig. 3 represents a view ofthe under side of themachine.Fig. et represents a portion of the mechanism as it would appear in topView by removing the bed-plate of the machine. Fig. 5 represents 'avertical cross-section through the cloth-feeding device andshuttle-carrier. Fig. 6 represents a vertical cross section through theupper front portion of the machine, as at zz, Fig. 2. Fig. 7 representsthe needle-bar and cani which actuates it.

Similarletters of reference, where they occur, denote like parts in allthe figures.

My invention relates to the manner in which the take-up arm is guided byan upright bar operating on the periphery of a cam, against which it isretained in contact by means of a spring operating under the rear endofthe take-up arm.

My invention also relates to the manner in which the hand-wheel anddriving-pulley are retained in position when running loose on the shaftby means of a washer and set-screw placed in the end of the shaft,thereby taking up also all lateral lost motion.

My invention also relates to the manner in which the cloth-feedingdevice is operated by means of a long lever having a sliding andvibratory lateral motion, the motion being produced by a cam attached tothe upright shaft pressing` its beveled rear end against a rollercarried by the stitch-regulating lever.

My invention also relates to the manner in which the length of thestitch is regulated by means of a lever operated by a thumb-screw, so asto bring the roller which it carries nearer or farther from the cam onthe vertical shaft,

thus varying the lateral motion of the long lever, and, consequently,the length of the stitch.

Toenable others skilled in the art to make anduse my invention, I willproceed to describe the same with reference to the drawings.

To the bedplate A of the machine is attached the frame B, which carries,in suitable bearings, the main shaft C, to which motion is transmittedby means of the pulley D. This shaft C carries a bevel-gear, c, whichmeshes with another bevel-gear, e, attached to the upright shaft E, andgives motion to all the mechanism placed under the bed-plate of thcmachine.

To the forward end of the shaft C is attached the cam a, which carriesthe roller b. This roller operates in the groove of a cam, d, attachedto the needle-bar F, giving an up-and-down motion to the needle-bar ateach revolution of the shaft G.

In the rear of the needle-bar, and directly over the cam a, there is ashort upright bar, Gr, which is susceptible of an up-and-down motion,and serves as a guide for the take-up arm g. This arm is pivoted to theframe at l, and is kept in contact with the lower portion of the uprightbar Gr by the spring f, which presses under its rear portion at 2.

There is a groove, 3, cut in the front part of the frame B, throughwhich one end of the take-up arm g projects to receive the needlethread.

To the lower end of the vertical shaft E the crank H is attached, and tothis crank is pivoted the connecting-rod I, which transmits motion tothe plate i. This plate carries the shuttle-driver and shuttle h, andworks in horizontal grooves 7c, cut into guides A1, formed on the bottomof the bed-plate A. The plate 'i also carries a small plate, t', beveledon its upper face to raise up the cloth-feeder K above the bed-plate ofthe machine and take a new hold on the cloth.

To the vertical shaft E is attached, near its lower end, the cam l,which operates against the end of the long lever L. This lever isretained in position by the guide m. which allows it to have a slidingand also a vibratory or lateral motion. rllhe rear end of the lever Lhas an elbow, which is beveled at 5, where it strikes the roller 6,attached to the stitch-regulating lever M, causing it to move laterallywhen its rea-r end is pressed by the cam Z.

The lever L is kept in position against the cam l by the spring n, andthe leather stop o keeps it from moving too far sidewise. The forwardend of the lever L en gages with the cloth-feeder K, and move it to 011eside in feeding the cloth, from which position it is retracted by thespring p, which also presses the cloth-feeder K downward to release itfrom the cloth.

The cloth-feeder is formed with the usual serrated teeth. It carries,also, a plate, g, which is adjusted by two set-screws, so as to projectthe serrated teeth (more or less) into the cloth. The cloth-feeder K isalso connected to the machine by means of the pin s. The platee' beingplaced directly under the line of the needle, shuttle face-plate A2, andcloth-feeder K, the shuttle is operated, and the cloth-feeder is raisedby a simple and positive motion.

The pulley D and hand driving-wheel D can be loosened on the shaft C byslacking up the set-screwtwhen operating the bobbin-Winder, the pulleyand wheel being` then retained in proper position on the shaft by meansof the washer i and screw u, attached to the end of the shaft C.

In operating with this machine, the thread is passed from the spool 7 tothe guide 8, and around the tension-wheel 9 to the guide 4, in front ofthe machine, then through the eye of the take-up arm g, and down to theeye of the needle. It' the shaft C is then revolved, the

roller b, operating in the cam-groove d of the needle-bar, will causethe latter to move up and down, while the take-up arm g follows themotions imparted to it by the cam ct independent of the abrupt motionsof the needle.

Dur-

ing this time the shaft E revolves, and the crank H will cause theshuttle h to play forward and backward, the small beveled plate iraising up the cloth-feeder K at the proper time, While the long lever Lmoves it forward. When actuated by the cam land roller 6 of theregulating-lever M, this lever is pivoted to the frame at fu, andsecured by a thumb-screw, W, passing through a slot, fr, in thebed-plateof the machine, so as to bring the roller 6 nearer to or farther fromthe incline 5 and make long or short stitches. The machine is alsoprovided with a presser-foot, y, to keep the cloth down.

Having thus fully described the construction and operation of mymachine, what I claim therein as new, and desire to secure by LettersPatent, is

l. The combination, with the take-up arm of a sewing-machine and the cam(t, which operates it, of the upright guide-bar Gr and spring j',substantially as and for the purpose set forth.

2. In combination with the cloth-feeder bar K, constructed as specified,the long lever L, operating with a sliding and vibratory or lateralmotion, by means of the cam l, bevel 5, and roller 6, substantially asand for the purpose set forth.

3. In combination with the long lever L, operating as described, thebent lever M and roller 6, when one end of the leve'r M is pivoted tothe bed-plate and the other is kept in position by a thumb-screw, forthe purpose of regulatin g the length of the vibration of the lever Land the length of the stitches, substantially as described.

CHARLES PARHAM.

Witnesses:

SAML. P. PARHAM, JAMEs J. METER.

